I have an older 17L with a factory ported barrel. I've had it for many years and it probably has 3000-4000 rounds through it. In all the years I've had it, it has functioned flawlessly with all types of ammo, including reloads. Last week I shot about 200 rounds and had several stove-pipes and malfunctions. I tried three different types of ammo, albeit nothing special (Federal, Winchester, and some reloads). They all gave me the same experience. Is there something that would suddenly "wear out"? I don't feel like a few thousand rounds is that much for a Glock, so it seems odd. Any ideas?